方向性比 的英文怎麼說

中文拼音 [fāngxiàngxìngbǐ]
方向性比 英文
front to back ratio
  • 方 : Ⅰ名詞1 （方形; 方體） square 2 [數學] （乘方） involution; power 3 （方向） direction 4 （方面） ...
  • 性 : Ⅰ名詞1 （性格） nature; character; disposition 2 （性能; 性質） property; quality 3 （性別） sex ...
  • 比 : Ⅰ動詞1 （比較; 較量高下、 長短、距離、好壞等） compare; compete; contrast; match; emulate 2 （比...
  • 方向 : direction; orientation
  1. It has the good qualities of both tem horn antenna and dipole antenna, less dimensions construction, good direction and higher efficiency. its impedance and radiation are analyzed. good agreements are obtained from experiment and calculation

    這種平面喇叭天線採用了新型的平衡饋電方式，結構簡單，性能良好，同時結合了tem喇叭和振子天線的優點，結構維數低，具有較強的方向性、較高的效率，在uwbsar軌道系統實驗中取得了比較理想的結果。
  2. The research on attenuation features of intensity in the yunnan region by using intensity isoseismals of 127 earthquakes, and the following three conclusions have been put forward : ( 1 ) average ratio values of long - axis to short - axis of innermost isoseismal in the yunnan region is larger than eastern china and smaller than western china

    摘要本文利用127次地震等震線資料，對雲南地區地震烈度衰減特徵進行了研究，其結果表明： （ 1 ）雲南地區地震烈度極震區等震線的長軸、短軸之比的均值，高於我國東部地區而略低於西部地區的平均值，烈度衰減方向性強。
  3. The laser unit, because of its monochromaticity and small divergency, is used as sensor ’ s light source. devices and chips provided with high - speed responsing and processing capabilities are employed. as a result, the achieved uncertainty of time measuring is 125 ps, demonstrating an accuracy improvement in magnitude of an order

    在設計製作中採用了單色性和方向性好的激光作為光源，選取了高速響應和有高速處理能力的一系列器件、晶元，因此時間測量的精度達到了125ps ，比以往的測試方法提高了1個數量級以上，速度測量精度達到掃描速度的0 . 1 % 。
  4. Compared with the effect of mutual coupling to general antenna arrays, chebyshev - dolph antenna arrays, schelkunoff super - derective arrays and chebyshev - dolph super - derective

    比較了互耦對等幅同相天線陣、 chebyshev - dolph天線陣、 schelkunoff陣和chebyshev - dolph超方向性陣天線遠場方向圖的影響。
  5. Because super - directive arrays can supply better directive performance than the general arrays, we analyses the two pattern synthesizes that is the schelkunoff unit - circle method and the chebyshev - dolph super - directive synthesis method of the line arrays in detail

    由於超方向性陣列天線可以提供比普通陣列天線好得多的方向特性。本文尤其對線陣的schelkunoff單位圓綜合法和chebyshev - dolph超方向性綜合法作了詳細的分析。
  6. On basis of fractal theory and the principle of fractional brownian motion, this paper puts emphasis on the following parts : firstly, the determination of fractal non - scale range on calculate fractional dimension is discussed, which adopts method associated artificial cognition with track decision. secondly, primeval data are segmented into blocks to evaluate their sub - fractional dimensions. in this process, the maximal value of sub - fractional dimensions in different directions is prioritized

    本文利用分形幾何理論與分形布朗運動原理，重點研究和分析了以下的幾個問題：分形維數計算時無標度區的確定，使用了人工法與軌跡法相結合的方法；對原始數據進行分塊分別計算其子分形維數，考慮了實際地形特徵的方向性，計算得到的子維數為局部的最大坡度方向上的方向維數；改進了傳統的隨機中點移位（ rmd ）內插技術，使用不同的插值比系數進行插值。
  7. At the end of this chapter, there are some observations ob the future shape of the tbr. chapter : the author has intensified her efforts to identify problems that could improve recourse to the market access investigation procedure in china. to sum up, the author makes several concrete proposals

    首先，簡要論述我國必須建立貿易壁壘調查法律制度的必要性；其次，通過比較，總結我國《對外貿易壁壘調查暫行規則》的特點；最後，在借鑒的基礎上，對如何完善我國貿易壁壘調查法律制度提出方向性的建議，包括法規的完善和相關配套措施的建設。
  8. Methodological research of measuring motorcycle valve phase and compression ratio is put forward in this paper. the devices mentioned above can be applied to develop and manufacture such kind of motorcycle engine. farther research work can be carried out to discover more valuable results

    本文提出了一種測量氣門相位和壓縮比的方向性方法，文中所述的裝置可以完全運用於科研開發和生產實際中，同時可對該種方法開展進一步的研究。
  9. The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment. the numerical results show that a more focused beam radiated in the broadside direction is achieved. the gain of the pbg patch antenna in the forward direction is improved by about 6 db. the radiation directivity is improved significantly and reaches 11. 5 db, which is 0. 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4. 1 db less than the difference achieved by thevenot et al.,

    用fdtd方法並結合pml吸收邊界條件，我們對加了這種新的覆層結構並且基底鉆孔的復合結構電磁（光子）晶體貼片天線的性能進行了研究，結果證明加了這種新的電磁晶體覆層結構以後，天線的波束收攏很多，並且向前輻射的增益大大提高，與普通天線相比，天線的e面和h面方向圖上向前輻射的增益均提高了約6db ，另外，該復合結構天線的方向性系數達到了11 . 5浙江大學博士學位論文db ，與該物理尺寸天線的方向性系數的理論極限值（ 11 . 9db ）相差0 . 4db ，該差值比thevenot等人設計的電磁晶體覆層天線的相應差值減少了約4 . 1db ，比qiu等人設計的電磁晶體天線的相應差值減少了約1
  10. Abstract : the crystal structures obtained by static solidification and vibration solidification were compared. it was showed that, in the case of vibration solidification, the orientation growth of the columnar crystal was not obvious, the equiaxial crystal appeared more early. the grains of both types of crystals were quite fine, hardness in the full section was relatively high, and the hardness distribution was uniform. in the former case, the solute segregation in dendritical austenite more severe, and there were lumps of distortion inclusion

    文摘:對球鐵金屬型靜凝固與振動凝固的結晶組織對比表明：後者柱狀晶方向性生長較弱，等軸晶出現較早，且兩者的晶粒均較細，全斷面硬度較高且分佈均勻；前者枝晶奧氏體內溶質偏析大，有畸變夾雜團塊。
  11. Chosen the cvsd as the radio station ’ s voice coding. the character of strong anti - interfere in real communication circumstance was our major consideration to choose cvsd. as to validate the algorithm of cvsd and get the better parameter, we do the cvsd algorithm simulation firstly with matlab and the simulation tested the algorithm as well as given us some tips during the hardware debugging

    在實際設計和實現語音編碼過程中為了對硬體編程語言有好的指導作用以及得到比較好的編碼參數，首先用了matlab對語音編碼進行了模擬，通過模擬驗證了演算法同時獲得的參數為實際的硬體實現提供了一定的參考價值，也給我們的實際調試指出了方向性的指導。
  12. Finally, compared with the 2d result, the synthetic jet that 3d numerical simulated has a definite direction. the 3d result, however, has a much smaller fluctuation owing to the span - wise instability which created a breakup of coherent vertical structure into smaller scales, it therefore compares more favorably with the measured data in tests

    三、三維模擬結果顯示合成射流的方向性極佳，與二維模擬相比較，三維數值模擬的速度波動較二維模擬要小，旋渦的相干結構衰弱，這是因為三維模擬考慮了流動的橫向不穩定性，這更加接近實際情況。
  13. Still, the change of vg parameter in the beam was investigated in this thesis. dilation of plastic belt in the beam is also studied. analysis show that there is clear direction during the dilation of plastic belt, which is similar with the path of shear - mode fracture

    分析表明塑性區的擴展有明顯方向性，據此得到的塑性區擴展方向與剪切型斷裂時的斷裂路徑比較接近，也與加載過程中韌帶區出現的集中剪切滑移線的方向比較一致。
  14. The results show that when evaluated with the indexes of cross entropy and contrast, it performs better than the wavelet transform based fusion method with the fusion rules of maximum absolute coefficient and maximum directive contrast

    模擬實驗表明，較之於基於最大絕對系數和最大方向對比度的小波變換融合方法而言，該方法在交叉熵和對比度意義上性能更佳。
  15. The al - di ( articulation index weighted - directivity index ), which is a measure for the improvement of the signal - to - noise ratio, is increased by about 30 percent for the trimictm technology. this corresponds to an improvement in speech intelligibility of up to 30 %

    研究亦顯示，在吵雜環境中，即語音與噪音的比率較差時，方向性麥克風對聽障者尤其有效，言語理解能力可提升至30 % ，使聽障者更容易與人交談。
  16. Compared with other algorithms, the first - order gradient algorithms and the neighboring extremal algorithms are adopted to resolve tpbvp, at the same time we found out the relation between them

    在比較各種解法基礎上，最終具有方向性地研究了梯度法和鄰近極值法，並找到了二者之間的聯系。
  17. Taking erectophile type continuous vegetation as a example, authors had done many monte carlo simulations, and established empirical analytic expressions of radiances with component temperature, soil emissivity and leaf area index. empirical analytic expressions were used to construct objective function and genetic algorithm was employed to synchronously retrieve 5 parameters, such as component temperature, soil emissivity and lai, from thermal infrared 2 channels and 2 angles data. many experiments of genetic algorithm inversion from simulated data were conducted, results show that it is very robust to retrieve component temperature using genetic algorithm ; genetic algorithm can cope with uncertainty inversion problem pretty well if full advantage of priori knowledge was taken. comparison between inversion results and ground - truth data has been done. this paper offers a new example to retrieve component temperature from multi - channel, multi - angle thermal infrared data based on the model of directionality of thermal radiance

    在熱輻射方向性規律的基礎上，以喜直型連續植被為例，進行了大量的monte carlo模擬，建立了輻射亮度和組分溫度植被葉面積指數及土壤比輻射率之間的經驗函數關系。採用遺傳演算法，從熱紅外2個波段2個角度數據中，同時反演混合像元組分溫度土壤比輻射率和葉面積指數等5個參數。通過對模擬的觀測數據進行大量的遺傳演算法反演試驗，結果表明，遺傳演算法反演組分溫度非常穩健，在寬松的先驗知識條件下，遺傳演算法可以解決不確定性反演問題。
  18. Single - layer model is convenient to apply but the unclear relationship between radiative and aerodynamic temperatures is still a bottleneck in this field. a new method was developed to derive reliable surface heat fluxes from radiative temperature viewed from arbitrary zenith angle. aerodynamic and radiative temperatures are connected through a so - called optimum component fraction ( ocf ) parameter - the fraction of vegetation in the field of view when the two temperatures are equivalent in oblique viewing

    該方法利用表面熱輻射方向性和顯熱通量都是源於土壤和植被溫度的貢獻這一共同點，發現在一定傾斜角度的觀測下，視場中植被與土壤的比例可以較好地反映植被和土壤與大氣進行湍流熱交換的貢獻率，所以稱該方法為最佳組分面積比法，用最佳組分面積比可以將任意角度下觀測到的輻射溫度訂正為空氣動力學溫度，經過地面和遙感數據驗證表明，用該方法計算的通量精度高於普通的單層模型。
  19. In the circumstances of the te11 mode mixed with the given parasite modes, the errors from the practically used directivity can be corrected with the calculated difference between dh and d. the effective area of the receiving antenna is calculated with the established models, and measured at some points in the given frequency range

    在已知混入te11模式中雜模成份及其比例的情況下，可以通過計算出dh與d的差值，對採用的方向性系數進行誤差修正。通過建立相應模型，對接收喇叭的有效面積進行了計算，並在部分頻率點上進行了實測。
  20. 2. methods in frequency domain : through a comparative study, wedge and ring feature of fourier transform performs better than other features based on texture spectrum. it represents the directivity, coarseness and regularity of an image

    在基於頻率域的紋理分析方法中，分析了基於傅立葉變換的紋理分析方法，經兩組對比實驗，楔環特徵能夠很好的反映圖象紋理的方向性、粗糙性和規律性，在檢索中明顯優于基於頻譜的簡單統計特徵。
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